1 the greatest athletes from all over the world gather together in one city (to take)part in the biggest sporting event on the earth 为什么用动词不定式呀。作什么成份呀
2 but if you want some body to know that you like them and that you enjoy being with them, you don't have to say anything _you should just let your body talk 什么意思呀。
3 what are on show in the museum?
-- some photos ____ by African children.
are taken were taken taken have been taken选那个呀，什么成份呀

1.这里是用动词不定式表示目的状语，意思是：全世界最优秀的运动员都聚集到一个地方，参加世界上最重大的体育活动。只是句子长一点，不要看不出来结构。类似的例子：They will come to my house to have a party. 他们会到我家聚会。

2.如果你想让别人知道你喜欢他们或者是你喜欢跟他们在一起，你并不需要说出来，只要靠身体的肢体语言表达就可以了。这里是拟人的手法，因为我们知道body
language 是肢体语言，所以这里作者用了“talk”

3.选taken。注意这里只是一个“短语性名词”来回答提问中的what.不能用句子回答。are taken, were taken, have been taken 都是句子。回答了就答非所问。别人问你“什么在上映？”你不能回答：“在美国有人拍了一些图片”，只能回答：“在美国拍的一些图片”。大家以为呢？