谁帮我用英语造10个现在完成时的句子,急用.

I haven't met him since I left the elementary school。自从我小学毕业以来,我一直没有见过他。How long have you had the cold?你已经感冒多久了?How many times have you been to Beijing?你去过北京几次?I have learnt English for four years。我已经学习英语四年了。He has met her at the library。他在图书馆遇到过她。We haven't met since then。自那以后我们再没见过。Has your father gone to America?你的父亲去过美国吗?Tom has skated for five hours。TOM已经滑冰五个小时了。I have read a book these days。这几天我一直在看一本书。Have you had your lunch yet?你已经吃过午饭了吗?现在完成时常与for+一段时间,或since+过去时间点/一般过去时态的从句连用。我这两天在给学生讲这个时态,希望能够帮到你。