Present

Present-tense (incompletive in Donohue's system) forms are formed with a suffix containing a coronal consonant followed by a. Each dialect has wildly differing, but generally phonologically conditioned systems governing exactly which consonant does the present suffix begin with.

Van Driem also notes a "hard" vs. "soft" stem among open syllables, with "hard" open syllables taking different ending allomorphs than "soft" ones.

The present form is negated by preceding the verb root with me (mi in Chunmat).

Experienced past

The experienced past (or personal perfective in Donohue's notation) is used to express past events that the speaker (or second-person addressee) themselves personally witnessed or experienced happening.

The experienced past is marked with either -s or no ending attached to the verb root; the distribution of the two markers varies by dialect. Root-final -k is also deleted in the experienced past in many dialects.

The experienced past in -s cannot be negated. Instead, to form a negative experienced past form with the negative prefix ma, -t is suffixed to the verb root after soft open stems. After other types of stems, no suffix is attached.

In non-'Ura dialects, the verb gai "to go" irregularly forms its experienced past with -e. On the other hand, in 'Ura, gai simply takes the regular -s.

Inferred past

The inferred past (impersonal perfective in Donohue's work) is used to indicate a past event that the speaker did not personally witness occurring, but can infer to have happened based on leftover evidence. In all verbs, the inferred past is formed with the suffix -na (in Chogor and Chunmat), -zumut ('Ura) or -simut (non-Chutö Tang) after the verb root. The inferred past is negated by having ma precede the affirmative form.

The contrast between experienced and inferred past forms can be exemplified as follows, with both phrases translating to "he has eaten" and featuring the verb zu "to eat":

• Chit zus, in the experienced past, implies that the speaker saw the subject eat something.
• Chit zuna, in the inferred past, implies the speaker did not see the subject eat something but can deduce that eating had occurred, e.g. due to the disappearance of food the subject had eaten.

Experienced imperfective

The experienced imperfective is formed by suffixing -sa or -ba to the verb root; the former occurs after soft open-syllable verbs, and the latter elsewhere. The suffix -ba may be lenited to -wa in fast speech. The experienced imperfective cannot be negated; instead the negative experienced past form is used.

Nominalizer -i

The nominalizer -i can be attached to the experienced imperfective to form what Van Driem calls the past participle. In negative phrases, -i becomes -i-gi after soft open-stem verbs and -gi elsewhere.

The past participle has two functions:

• To create verbal modifiers for nouns;
• To create periphrastic constructions with the copulas wen (in the affirmative) and min (in the negative). They denote perfect aspect, and are also used in phrases declaring the identity of the perpetrator of a past event.

The nominalizer -i can also be suffixed to the infinitival future to allow the infinitival future to modify a noun.

Infinitival future

The infinitival future (or personal irrealis in Donohue's work) is formed with the suffix -mala (in Chogor and Chunmat) or -sang (in 'Ura and some of Tang). It is used to denote events that may happen in the future.

The infinitival future can be followed by the copula wen to indicate a planned event.

Volitional future

The volitional future, in contrast to the infinitival future, indicates an action that the subject either intends to do or is confident will happen in the future. It is formed with the suffix -ge. Van Driem exemplifies the contrast between the two futures with the following pair:

The negative volitional future is formed with the negative prefix me (or mi in Chunmat). The suffix -ge is omitted in the negative unless the evidential marker -na is present.

Supine

The supine (or infinitive in Donohue's work) is formed with a suffix in the shape -CV (a consonant followed by a vowel) whose form varies depending on the phonetics of the verb root.

• The vowel of the suffix is o everywhere except after a high vowel /i/ or /u/; in that case the suffix vowel becomes u.
• The consonant of the suffix is:
  • -g- after -k, e.g. pok-go "to beat (someone) up".
  • -ng- after -ng, e.g. thong-ngo "to drink" and yung-ngu "to fetch".
  • -t- after -p, e.g. thap-to "to argue" and tup-tu "to cut".
  • -r- after soft open-syllable roots, like in zu-ru "to eat" and se-ro "to die".
  • -d- elsewhere.

The supine is used to form verbal complements to verbs like gai "to go", tshuk "can, to be able", and 'nyam "to feel like (doing)". Examples from Van Driem include:

Imperative

The imperative mood, used to express commands, is indicated via a suffix that is underlyingly -lae (which may be contracted to -lä in rapid speech). This suffix has many allomorphs:

• Root-final -t is deleted in the imperative, so dot "to sleep" and sut "to kill" form do-lae "sleep!" and su-lae "kill!".
• -lae becomes -mae after -m, e.g. in num "to sniff, smell" with imperative num-mae "sniff!".
• The -l- in the imperative suffix is lost after -ng, -k, and -p. -k and -p, in turn, become voiced to -g- and -b-. For instance:
  • yang "to stand" forms the imperative yang-ae "stand up!"
  • pok "to beat" forms the imperative pog-ae "beat!"
  • tup "to cut" forms the imperative tub-ae "cut!"
• Soft open-syllable verbs have particularly volatile imperative formation. Donohue posits an underlying -e suffix.
  • This suffix may be lost if the root vowel is already e, or coalesce into a diphthong ye like in se "to die", where Donohue reports imperatives sye and se.
  • If the soft-stem verb ends in a i or u, Donohue and Van Driem do not agree on the result. Van Driem observes that the verb root vowel is changed to e or ö, respectively. On the other hand, Donohue says that i soft-stem verbs are suffixed with -ye, while u/o soft-stem verbs have the u or o of the root coalesce with the -e suffix to form -we.
  • -e fuses with -a to form -ai. Thus, tsha "to see" forms the imperative tshai "see!".
• Irregular imperatives include wai (for o "to bring"), hrai (for ra "to come"), and ga-lae (for gai "to go").

Gerund

The gerund (or sequential in Donohue's work) is used to mark events that occurred at the same time as, or just immediately before, the action of the main verb. It is also used to form the verbal complement of zat "to finish". It is marked with the suffix -se (or in Chunmat, -si or -zi) after the verb root.

Examples of the gerund include:

Adhortative

The ending -kya is suffixed to verb roots to form adhortative phrases that encourage others to do something. For example, gai "to go" forms the adhortative gai-kya "let's go".

Optative

The optative mood is indicated with an ending -ga in most dialects. Some dialects instead have the optative ending -(n)ja, which manifests as -nja after open syllables (both hard and soft) and -ja after other syllables.

Hearsay evidential

Bumthang has two particles that mark hearsay that follow the verb; they are shu for interrogative phrases and re for non-interrogative phrases.