Have you decided when_____?为什么用to travel

Have you decided when_____?为什么用to travel have you decided yet?yes,i decided at once为什么钚用have decided Have you decided whome to go with?为什么是whome? have you decided to tell him? Have you decided whom to go with? Have you decided（ )to New York Have you decided what to do next?中what为什么不能换成how? 是Have you decided ( ）on winter vacation?空格里为什么不能填what to do Do you like to travel?为什么travel做动词了? Have you decided what you want to do after school have you decided ___________yet? To you,i have decided to love life翻译.