I have a hard time doing sth. 这句里的"doing sth"是什么成分?现在分词作time的定语吗?

have a hard time I have a hard time going back to them. 句型转换 I have a hard time learning mathI have a hard time learning math.I ____ ____ learning math. i have a hard time learning english同义句i have（）time （）english have a hard time造句 have a very hard time have a hard time doing 还是have hard time doing i have a hard 翻译：i have a hard time even recoginzing people i have been introduced to. I really have hard time to 翻译句子 1.I had a hard time finding you.2.Do you have a hard time with your study? have a hard time have a difficult time 区别 Because I donnot like English I have a hard time _English-上应添什摸 1.____been____for the family;they have been living a hard life.A.Times have;hardly B.The time has;hard C.Times have;hard D.Time have;hardly 做什么成分?什么时候用?） 2.----Do you mind if I open the window?----_____I feel a bit cold.A.Go ahe have a hard time doing sth I have a hard time _____ English now.填study还是to study? I have a hard time(to know/knowing)who my real friends are. I think you’ll have a hard time ____(learn) Japanese in 30 days.怎么填?