How do you convert present tense to past tense?

Answer 1

That depends on the verb. In English we have regular verbs, which take an -ed at the end, and irregular verbs, which do whatever they want.

I will use convert for my first example.

Convert is a regular verb. The simple past tense is converted.

Lie is an irregular verb (what you do in bed, or what you tell your dog to do).

The simple past tense of lie is lay. The past participle of lie is lain.

Verbs are very confusing and very tricky little words.

Answer 2

To convert present tense to past tense, you typically add "-ed" to the end of regular verbs. For irregular verbs, you will need to change the verb form. For example, "I walk" (present tense) becomes "I walked" (past tense).