第一句是现在分词作条件状语,注意把and 去掉!
第二句是个常见的句型:
祈使句(动词原形开头,表条件) + and + 陈述句(一般用will + 动词原形)
Work hard ,and you'll catch up with him.
=If you work hard,you'll catch up with him
如果表否定,中间用or
Hurry up,or you 'll miss the train.
=If you don't hurry,you'll miss the train