高一英语非谓语动词高手请进
whether----,wewillhaveapicnictomorrow.
A.permitB.permitsC.permittedD.permitting
----carefully,thisletterisverybeautiful.
A,typeB.typingC.typedD.totyped
请问什么时候用过去分词,什么时候用-ING形式?谢谢