关于英语句子成分Alltheduckslyingquietlyuponthewater,orstandingontheirheadsinitfortheycoulddothatswamsuddenlytotheshore.for引导的是分句吗?怎么前面没有逗号,而且缺少另一个分句.thatswamsuddenly

　　关于英语句子成分

　　Alltheduckslyingquietlyuponthewater,orstandingontheirheadsinitfortheycoulddothatswamsuddenlytotheshore.

　　for引导的是分句吗?怎么前面没有逗号,而且缺少另一个分句.thatswamsuddenlytotheshore这又是什么成分呢?

　　Therosebushcoveredthewallandhungoverthewater,inwhicheverythingappearedasinapicture,onlythateverythingstoodonitshead.

　　onlythat在这是连词吗?

　　Mygrandfatherwasamongthefirsttosettlein(which)isnowthefamousplaceinAsia.为什么用whichwhich引导宾语从句除了那一个之外还有其他词义吗?