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if的用法
if的用法和例句：1.if 如果、假如if+句子；跟着if的句子用一般现在时表将来If it rains tomorrow, we will not go out.如果明天下雨，我们不会出去。She will be unhappy if s...
however的用法
however的用法1.however adv. 然而、可是I love your cooking. However, I already have plans for dinner tonight.我喜欢你做的菜。然而，我今晚...