what did you see?I saw many people planting trees on the hil
6个回答

what did you see?你看到什么了?

I saw many people planting trees on the hill.我看到很多人在山上种树.

see sb do sth是看到的整个过程,

see sb doing sth.看到的是正在进行的动作.

例如:i saw sb steal your bike.指的是整个偷车的过程都看到了.

i saw sb stealing your bike.只是看到了偷车的动作.二者强调的重点不同.