There (happen )__ to be only two eggs in the refrigerator 请各位高手看看怎么变化形式?

On the beach,there is always someting __. A.happen B. happens C.to happen D.happening There (happen )__ to be only two eggs in the refrigerator 请各位高手看看怎么变化形式? there happened to be 还是there happen to be把happen换成appear呢? what will happen if there to much rain if there is no water,what will happen to us 练词成句 happen what there they see would to stayed happen to happen to happen to 动词时态完型填空：What __(happen) here There is blood on the floor. happen to ,happen 怎么用? It took there years__ __ __ __ __ (他才能够).return to table tennis. They never knew what __(happen)to the world in a hundred years They never knew what __(happen)to the world in a hundred years Listen!There is something unusal _____in the next room.A:happening B:happen C:to happen选什么?为什么? 非常急there's always something ______ at the mallA happening B happen C happens D to happen 几道英语选择 如下1.All the trees in the forest were cut down for money, __ big floods to happen every year.A.causing B.to cause C.caused D.cause2.there __ no tickets left ,the visitors had to return home from the museum .A.were B.had what do you think to happen there yesterday 中TO为什么Y要加?