It is hard to fall ___(sleep)after drinking some coffee

it is hard to say goodbye同义句 _ _ _ is hard I think it hard to fall asleep in night.请问it后为什么不加is. I think it hard to fall asleep in night.为什么it后面没有is It is hard to fall ___(sleep)after drinking some coffee It is hard to he found it hard to get to sleep.改为同义句 It is— — him to fall asleep. I found it hard to fall asleep at night.请问it后为什么不加is.请详细解释 It's hard to fall in love with someone? The man found it hard to fall _____ (sleep). some people find it hard to fall asleep翻译 It is hard to wait It is hard to please It is hard to select! 1.It is unlucky for you to fall off the bike.2.It is hard of you to get there on time.以上两题错在哪里 --Daddy,math is hard to learn.I failed the math exam again.--oh,don't____it because it is very useful.A.stop B.drop C.fall D.feel He can answer the question h _ hard it is. Thought it is raining hard,the workers keep _ (work) It is hard to study English g______well.