for a while可以放句首。
for a while引起让步状语从句,意思是“虽然…但是….”、“尽管…但是…”(多放于句首)。
for a while
英 [fɔː(r) ə waɪl] 美 [fɔːr ə waɪl]
暂时。
For a while, she lost the use of her limbs.
好一会儿她四肢都动弹不得。
His licence was suspended for drunk driving.
他的驾驶执照因酗酒开车被暂时吊销。
He suffered a temporary loss of memory.
他暂时丧失了记忆。
They chatted for a while and then went to work.
他们聊了一会儿,然后上班去了。