Iamgoingtodosomething。这是一个表达准备去做某事的句型，主语是I，动词是amgoingto，后面接做的具体动作。表达要去做某事的英语句型还有，Iplantodosomething，Idecidetodosomething，Iintendtodosomething，Iamabouttodosomething，Imonthepointofdoingsomething等。