1.babysit(名词)(过去试)
babysitter,babysat
2.plan(过去试)
planned
3.send(过去试)
sent
4.ride(过去试)
rode
5.leave(过去试)
left
6.nature(形容词)
natural
7.forget(过去试)(反义词)
是forget吧...
forgot,remember
8.for(同音词)
four
9.get back(同义词)
return
10.beach(复词)
beaches
11.think(过去试)
thought
12.one(序数词)
first