Present-Any Agreement.
If the verb in the Principal Clause is in the Present Tense, the verb in the Subordinate Clause may be in Any Tense, according to the meaning.
Principal Clause |
Conjunction |
Subordinate Clause |
I know |
what |
he does. he is doing. he has done. |
I know |
what |
he did. he was doing. he had done. |
I know |
what |
he will do. he will be doing. he will have done. |