1)for
判断改错：
(错)Forheisill,heisabsenttoday.
(对)Heisabsenttoday,forheisill.
for是并列连词，不能置于含两个并列分句的句子的句首，只能将其放在两个分句中间。2)so,therefore
Hehurthisleg,sohecouldn'tplayinthegame.注意：
a.两个并列连词不能连用，但therefore,then,yet.可以和并列连词连用。
YoucanwatchTV,andoryoucangotobed.
Hehurthisleg,andso/andthereforehecouldn'tplayinthegame. b.although…yet…，但although不与but连用。
(错) Althoughhewasweak,buthetr iedhisbesttodothework..
(对) Althoughhewasweak,yethetr iedhisbesttodothework.
