Please help me check it and give me the explain.....Thanks!

(1)I think this is better :He does not seem to be listening.
(2)OK.
(3)OK
(4)This is the happiest time in my life(LIVE is a verb...).
or This is the happiest time I ever have.
Ever and "in my life" have very similar meaning, so you'd better not use them together.
(5)(I am not quite sure what u mean, do u mean this?)
It's so late, so I'd better leave now.
(6)OK...though sounds a bit weird...but i think it is grammatical anyway..
(7)OK
(8)OK
(9)OK

(1)He 不似乎聽。(2)She 在家從未停留。(3)"You'd 更好現在回家。" (4)This 曾經是最愉快的時間在我活。(5)It 是因為我必須現在離開很晚。(6)She 對您經常生氣。(7)The 人一定吃了十二漢堡包。(8) 清掃地板是貝蒂的每天義務。(9)A 電腦花費很多金錢。

(1)He does not seem to listen. = 他似乎不在聽。
(2)She never stays at home. = 她從來都不留在家。
(3)“You’d better go home now.” = 你最好現在回家去。
(4)This is ever the happiest time in my live. = 這曾經是我生命中最高興的時間。
(5)It is because I have to leave so late now. = 因為我現在不得不晚些時候離開。
(6)She does often get mad at you. = 她經常對你極為惱火。
(7)The man must have eaten a dozen hamburgers . = 那個人一定吃了一打漢堡包。
(8) Sweeping the floor is Betty’s everyday duty. = 清掃地板是Betty日常的職責。
(9)A computer costs a lot of money. = 一台電腦耗費許多錢。

1)he doesn't seem to listen.
2she never stay at home.
3you should better go home now
4this is ever the happiest time in my life
5it is because i had to leave so late now
6?
7the man must had eaten a dozen hamburgers
8?
9?