像watch/help/let…sb+do sth 的结构 如果sb是单三,那么do是否要变does呢? 比如像 Gary often helps Lily ___(do) her homework. I watched Gary ___(sing) in the room 10 weeks ago. I let her ___ (go).
help sb (to) do sth Gary often helps Lily (to)do her homework. watch sb do sth 或者watch sb doing sth 如果是看到某人做过什么市,就用watch sb do sth 如果是看到某人正在做什么事,就用watch sb doing sth I watched ...