动词变单三
is-（ ） am-( ) meet-( ) look-( ) excuse-( )
thank-( ) do-( ) spell-( ) call-（ ） lost-( ）found-( ) are-( ) konw-( ) take-( ) bring-( )
need-( ) have-( ) let-( ) play-( ) sound-( )
watch-( )