是take action do sth还是to do sth?
take action to do sth 中action什么时候加s
take sb do sth还是take sb to do sth
take sb.do sth 还是 to do sth
take sb.doing sth.还是take sb.to do sth.
take turn to do 还是take turn do sth
take exercise +do sth还是doing sth还是to do sth?
是should to do sth 还是 should do sth?
是can to do sth.还是can do sth.
must 后面是加to do sth.还是do sth.
must 后面是加do sth.还是 to do sth.
是want to do sth and do sth还是want to do sth and to do sth?
take trouble to do sth.