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My mother is ill, I have to look after her.（改為同義句）

Mary studied in Wuhan four years ago. Now she is still studying there.（合并為一句）

I have said something important at the meeting.（改為否定句）

Jim's parents have lived here since ten years ago.（對畫線部分提問）

Han Meimei started to play computer games at the age of ten.（對畫線部分提問）

Fei Junlong and Nie Haisheng have been into_space.（對畫線部分提問）

Astronauts have already been to the Moon.（改為否定句）

My uncle has sent me many gifts.（改為同義句）

They have left the girl alone.（改為同義句）

I have already cleaned the blackboard.（改為一般疑問句）