Verbs - Polite Past Tense

Polite past tense is very simple because both positive and negative forms use the verb stem for conjugation.

Polite positive: verb stem + ました

Polite negative: verb stem + ませんでした

That's it! Here's a couple example sentences that use both forms.

先週はたくさん勉強しました。
Last week I did a lot of studying.

先月は毎日プールで泳ぎました。
Last month, we swam in the pool every day.

アヤトさん、昨日学校に行きませんでしたか？
Ayato, didn't you go to school yesterday?

ライトさん、先生と話しませんでしたか？
Laito, didn't you speak with your teacher?

I really want to get back on track doing more lessons. The issue is that the next 3-4 are less interesting topics, and they also require a lot of flash cards to learn vocab. But hopefully I'll be able to knock out two of them this weekend, and then I'll move on to more verb forms.