be indispensable to do还是doing
be found+doing还是to do?
be addicted to do还是doing?
be worth to do 还是doing
英语be going to do还是doing
be advised doing还是 to do
be successful in +doing 还是 to do?
be bound to do 还是doing
be surprised + to do还是doing
be difificult for sb do 还是doing还是to do
be indispensable for 与 be indispensable to 的区别
be willing to do还是be willing to doing
be equal to do还是be equal to doing