past, present, progressive practice

平日 は 学校 に 行きます present : I go to school on weekdays
平日 は 学校 に いきました past : I went to school on weekdays
平日 は 学校 に 行っていました past progressive : I was going to school on weekdays

(I would translate it to English "I used to go to school on weekdays.) 

平日 は 学校 に 行っています present progressive : I'm going to school during weekdays

(I would say "I go to school" or "I'm at school".) 

平日 は 学校 に 行きません present neg : I do not going to school during the week
平日 は 学校 に 行きませんでした past neg : On weekdays, I did not go to school
平日 は 学校 に 行っていませんでした past progressive neg : On weekdays, I wasn't going to school

(I would say "I didn't use to go".)

平日 は 学校 に 行っていません present progressive neg : I do not go to school during weekdays

Good job! I think that the direct translation of the progressive form sometimes sounds unnatural. There are cases that we have to change the meaning in one of the two languages, for example, 私は毎日英語を勉強しています="I study English everyday", 私は今英語を勉強しています = "I'm studying English now". Sometimes, the progressive form in Japanese express the situation, not only the action that "someone is doing now". I hope this was helpful.