Does= he/she/it. Did is past tense, do is present tense plural and does is present tense singular. Was is past tense singular and were is past tense plural.

When use the WAS were?

Generally, “was is used for singular objects and “were” is used for plural objects. So, you will use “was” with I, he, she and it while you will use “were” with you, we and they. ... Even though you are singular, you must use “were”.

What are the three forms of do?

Do: forms. Do is an irregular verb. Its three forms are do, did, done.