应从语义上去理解,如果加if it is going to rain this aftermoon,意思就变成了我不认为今天下午下雨或者不下雨,显然句义矛盾.
如果要用if it is going to rain.
应该是I don't know if it is going to rain this afternoon.我不知道今天下午会不会下雨.
应从语义上去理解,如果加if it is going to rain this aftermoon,意思就变成了我不认为今天下午下雨或者不下雨,显然句义矛盾.
如果要用if it is going to rain.
应该是I don't know if it is going to rain this afternoon.我不知道今天下午会不会下雨.