1) She is an actress who debuted a long time ago, and yet she has not appeared in many movies.
2) Even so, you cannot go wherever you want without telling me first.
3) I looked at the dog, who was smelling the ground, and I went after him.
4) Like in the previous war, people killed themselves using guns.
5) From what I know, when you use a key, you do not have to force the doorknob.
6) He is a good friend, though, at times, he can be aggressive.
adsfaf 4) Like in the previous war, people killed themselves using guns. Like in the previous war, people killed themselves with guns. ("With" is more common.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
adsfaf4) Like in the previous war, people killed themselves using guns.
Like in the previous war, people killed themselves with guns. ("With" is more common. Do you mean they used guns to commit suicide?)
The other sentences are good.