1.They may come __to_help_(help) you.
come和help两个动词有先后次序,用不等式to
2.The dolphins can stand up and __above(介词) water.
介词in表达在水里
介词on表达在水上,紧邻水面
介词above表达在水上,离开水面一点距离
1.They may come to help you.
2.The dolphins can stand up and above water.
to help
on: 站起来立于水上。
to help表示来的目的
down up and down上上下下