这个句子的完成时可以改成过去式么?
1、Herefusedtogountilhehadseen(saw)allthepapers.
2、Afterthewillhadbeen(was)read,therewereangryexclaimations.
3、BeforeIhadknown(knew可以么?)himforaweek,hetriedtoborrowmoneyfromme.
4、Myfriendexplainedthatthehousehadbeen(was可以么)originallybuiltasamonasterybuthadbeen(was可以么)convertedintoamanorwhenmonasteriesweredisslovedunderHenry.