One,sometimes I feel that distinguish between Australian English and American English it is difficult (distinguish....from)
2,short skirts have been popular,pop up dress down again (out of fashion)
3,I have a pen pal for two months had not received a letter from the (hear from)
4,he was late this morning,because he stayed up late last night (stay up)
5,he was always the same,like my daughter with whom I spoke (as if)