Question

一些关于英语的问题

1，You_____make such mistakes again
A.should never
B.should not always
C.would always not
D.would not forever
此题AB选项如何区分？
2, Since when______her?
A.did you know
B.have you known
C.do you know
D.you know
since提问的用法我不懂，请高手讲一下
3,We haven't heard from Jane for a long time.
What do you suppose________to her?
A.was happening
B.to happen
C.has happened
D.having happened
suppose的词组用法我没学，最好一一分析4个选项
4，_________we have today!
A.How fine day
B.What fine day
C.How a fine day
D.What a fine day
BD选项如何分辨？

另外如果你知道，请教我一下You need或You must开头的反义疑问句逗号后的用法
好的一定给分！

Answer 1

1.A
not always = little/few 少
never 无
2.B
since 常用于完成时，表示过去持续到现在
3.C
be supposed to do 应该。。。
suppose to do 认为。。。（将来）
suppose that 猜想。。。
此外，I/You suppose 还可以作插入语= I think
这句话里，do you suppose 是插入语，提问过去发生了什么，对现在有影
响，用完成时更好
4.D
关键看名词可不可数。day是可数名词，所以加a

need提问，反义疑问句
Yes，you must. No, you needn`t
must提问，反义疑问句
I must ..., needn`t I ?