I/You/We/They let. He/She/It lets. The present participle is letting.
The present perfect tense of let is:I/You/We/They have let.He/She/It has let.
The present perfect tense of let is: have/has let
Let does not change from present tense to past tense. Let is also the past participle.
The past tense of let is let. "Let" is one of the so-called "invariant" verbs: its present, past, and past participle are all "let". However, it is not literally invariant, because its third person singular present tense form is "lets" (note lack of apostrophe!).
If you were to say, to use a familiar quote, let my people go, then the tense of let is present, in the imperative mood.
For a regular verb let's use "answer". Present: answer, Past: answered, Past Participle: answered. For an irregular verb let's use "run". Present: run, Past: ran, PP: run.
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
let us gone If "let go" means "release" me or "drop it", it's "let go". (Only "let" is a Past Tense, as "go" is a short infinitive, therefore - it stays the same).
"Has" is in present tense. The past tense is "had".