■ bow and arrow

“弓箭”如果理解为一种武器的整体，作为主语时动词用单数。

• The bow and arrow was invented at that time.弓箭是那个时候发明的。

• wedding 与 marriage
• welcome
• well
• well-connected
• west
• western
• west 与 western
• what
• what
• what
• what
• what about
• whatever
• what..., what
• what, which 与 who
• what 与 how
• what 与 who
• when
• where
• where it counts
• whether
• whether 与 if
• which
• which
• while