it's=it is 是主謂結構。It's是 it和 is的縮寫形式。
its 是形容詞性物主代詞或者名詞性物主代詞。意思是它的。
it's
1、It's the best news I've heard in a long time.?
這是我很久以來聽到的最好消息。
2、It's been such a long time since I played.?
自我上次演出以來已有很長時間了。
3、I think it's my round.?
我想這輪該我請了。
4、I keep forgetting it's December.?
我總是忘了現在是12月了。
5、I think it's very rare to have big families nowadays.?
我想，如今大家庭已經很少見了。
?its
1、The British Labor Party concludes its annual conference today in Brighton.?
英國工黨的年度會議今天在布賴頓閉幕。
2、The dog lifted its head, listening?
那條狗擡起頭，豎耳傾聽。
3、I met one woman whose tiny baby had just died and whose other child was fighting for its life.?
我遇到了壹個女人，她那壹點點大的小寶寶剛剛死去，另壹個孩子也在死亡線上掙紮。
4、Each side set forth its position on this question.?
各方闡述了自己對這壹問題的立場。
5、The company has increased the price of its cars?
公司已經提高了汽車價格。