He often 后面的watch要加es;不加的话要加ed。often常用于现在时,也可用于一般过去时,主语为He,第三人称单数,所以动词watch要加es或ed。例如:
1.Early American weathervanes were most often cut from flat wooden boards.
美国早期的风向标大多截自平直的木板。
2.Students often travel hundreds of miles to get here.
学生常常赶数百英里的路来到这里。
如果后面没有具体的过去时态的词是要用呢一般现在时的,三单后面加es