几道英语题，急!!!

中译英：安全带 life belt / safety belt
用适当形式填空：What have you been doing (do)these days? I haven't seen you for a long time.
改写句子：My mother left for Paris five days ago.
My mother has been in Paris for five days.
问：begin的用法，有无begin doing sth.这种用法？有begin doing sth.这种用法,相当于begin to do sth.

-----高三英语教师在线

safety belt
have done
has been
begin doing 开始做某事
相当于begin to do

safely bell
what are you doing these days?
my mother has stayed in Paris for five days.
begin doing = begin to do

safety belt
were doing

have lived

没有的

safety belt
have done
has been
无