The present perfect tense of "be":
Have and has are both used in the present perfect tense:I/You/We/They have learned.He/She/It has learned.
The verb is is the present tense.
The past tense of did is did. The present tense of did is do. The future tense of did is will do.
It was, (past tense) it is, (present tense) it will be( future tense)
Past tense I had Present tense I have Future Tense I will have
Have and has are both used in the present perfect tense:I/You/We/They have learned.He/She/It has learned.
The formula for the present perfect tense is: has/have + past participle. To make it negative, add the adverb not.Examples:I have not walkedWe have not walkedYou have not walkedHe/she has not walkedThey have not walked
The verb is is the present tense.
The past tense of did is did. The present tense of did is do. The future tense of did is will do.
It was, (past tense) it is, (present tense) it will be( future tense)
Past tense I had Present tense I have Future Tense I will have
"Has" is in present tense. The past tense is "had".
No 'is' is present tense. am/is/are = present tense was/were = past tense
Present tense
the present of did is didnt Do is the present tense of did. Didn't is the past negative form
I/you/we/they buy. He/she/it buys.
Should is present tense.