Normally in the past tense, you do not need to worry about subject-verb agreement because you can conjugate most regular past tense verbs to the singular or plural by adding an -ed to the end of the ...

Here is a list of some of the most common patterns. Remember that an independent clause has a subject and a verb.

Express one idea per sentence. Use your current topic — that is, what you are writing about — as the grammatical subject of your sentence (see Verbs: Choosing between active and passive voice).