I have a letter to write

动词不定式是to write不定式都是to do something
不及物动词是write

有些不对啊？write letter 可以这样用，证明write是及物动词呀?

have something to do. to write 为不定式， write为不及物动词。动词就那两个，have 和 write。 而have及物