intransitive verbvi

transitive verb vt

Copula

Simple past tense did

Simple present tense do/does

Simple future tense will do, am/is/are going to do

Simple past future tense would do, was/were going to do

past continuous tense was/were doing

Present continuous tense is/am/are doing

past perfect tense had done

Present perfect tense have/has done

modal verb followed by verb base form

Modal verbs have two tenses: past and present The past tense can also express a euphemistic tone

Modal verbs do not have person changes

To change a modal verb to negation, add not directly after the modal verb.

Modal verbs express speculation, and the most likely one is must, which expresses certainty; The lowest possibility is can’t/couldn’t, which means impossible; the other means speculation, maybe maybe

Modal verbs can also express virtual

active voice

passive voice be done

substantive verb becomes negative

Coupling verbs, auxiliary verbs, modal verbs become negative

To emphasize the predicate verb part, you can directly add do/does/did in front, and then change the predicate verb back to its original form

do/does is used to emphasize the current action (does is used after the third person singular subject), and did emphasizes the past action.

It is usually emphasized that the predicate verb does not use the future tense