Since +時間點(diǎn),具體時間自從、、、、以來,從、、、以后” 用來說明動作起始時間
I have been in Beijing since 2010.
For + 時間段,用來說明動作延續(xù)時間長度,因此句中的謂語動詞,也應(yīng)該是延續(xù)性動詞。
I have been in Beijing for one year.
for +一段時間
since +句子
since +一段時間+ ago
since +時間點(diǎn)
例如 he has been dead for three years
he has been dead since three years ago
He has studied English since 2003
He has studied English since he was ten years old