不定时和动名词
manage to do sth 设法做...
afford to do sth 负担起做...
wisth to do sth 希望做...
apply A to B 把A运用B到中
seem to 似乎
see to 调查
explain to 解释
pay a visit to sp 参观某地
do one\' best to do sth 尽力
hesitate to do sth 犹豫