1.有标志词,already,yet,just,ever,never,before!2.有固定句式.It is the first time that It is the +adj.(est)+n that since 从句一般过去时,主句现在完成时 等等!
现在完成时态的用法,要详细的,越多越好,着重讲下否定形式的
1.有标志词,already,yet,just,ever,never,before!2.有固定句式.It is the first time that It is the +adj.(est)+n that since 从句一般过去时,主句现在完成时 等等!