Where không goes with đã, đang, sẽ

Không goes after sẽ and đã, right before the verb: Tôi sẽ không đi. I won't go. It's the same order as English "will not".

Sẽ không is the everyday "won't", and it often sounds like a decision or a promise: Em sẽ không quên. I won't forget. With a future time word, plain không is just as common: Mai tôi không đi làm. I'm not going to work tomorrow.

Đã không means "didn't", but it's used less than English speakers expect. With a past time word, plain không is enough: Hôm qua em không đi học. Đã không adds weight, often for something that should have happened and didn't: Anh đã không gọi. You didn't call. For "haven't yet", use chưa instead: Tôi chưa ăn.

Cũng (also, either) goes in front of them all: Tôi cũng sẽ không đi. I won't go either.

With đang, the order is less settled. For a state right now, đang không is heard: Em đang không vui. I'm not happy right now. For an action, people usually leave đang out: Tôi không làm gì. I'm not doing anything.