Sentence transformation:
1.It's + khoảng t.gian since S Valed: thời gian là... kể từ khi...
+S+HAVE/HAS NOT+V3/ed+FOR/SINCE+TIME
Ex: I haven't seen her for three weeks. It's......
2. S began/started+Ving/to Vago+S have /has V3/ed since/ for....
Ex: I started working for the company a y ...
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