1.What's he like now?他现在是什么样?(教材P25)What's sb. like?意为"..….是什么样的人?"
多用于提问人的性格、品质等，也可用于提问人的相貌。e.g.:-What's Alice like?
--She is quiet and a little shy.
What does sb. look like?意为“....长得什么样?'用于提问人的长相、外貌。
e.g.:--What does Tom look like?—He has short hair.
be like意为“像….一样”,同义短语是look like。e.g.The girl is like her mother.
1 be like意为“像......一样”,指品德、相貌等像;
更侧重人的个性特征，常与look like互换。
e.g.:The twins are like their father.
2 look like意为“看起来像...”，强调外观上像。
e.g.:He looks like his father.

2. It's been three years since we last saw our primary school
classmates.自从我们上次见到我们的小学同学以来，已经三年了。(教材第26页)
"It's been+—段时间+since+从句”意为“自从……….以来已经有多长时间了”，还可表示为“It is+—段时间+since+从句”
e.g.: It has been five years since I began to learn English.=lt's five years since I began to learn English.
since此处用作连词，意为“自从，自..…以来”。主句常用完成时，且动词需要用延续性动词。since后接从句，该从句用一般过去时态。
e.g.:She has taught us English since I came to this school.
【拓展】since还可以用作介词,意为“自从……以来”，后接表示时间点的词。
e.g.: He has worked there since 10 years ago.