notsure与notclear
notclear与notsure有什么不同啊?it'sclear与it'ssure呢?
另外,这句话里为什么要用another而不用one呢?
Thepictureswereofpeoplewhoweresothinthattheylookedlikebeingsfromanotherplanet.
那句话我现在明白了,可是前面两个词的辨析还是不太清楚,