这句话语法上有问题么？是什么？mr.david and his wife goes to work toghter every morning

mr.david and his wife goes to work toghter every morning
这里是指MR。DAVID 和他的妻子，一共两个人，这里应用复数，可视作他们，所以用GO TO WORK。
mr.david goes to work with his wife every morning
这里是指MR。DAVID一个人，而WITH HIS WIFE只是作为定语修饰MR。DAVID

go to work

his wife 是第三人称单数,就是可以用her代替~

这里主语是Mr David , with his wife 是修饰语．放在后面就容易理解了； ．．．goes to work with his wife every morning

这句话属于语法中的主谓一致.里面分为名词作主语的主谓一致,表示数量的名词词组作主语的主谓一致,不定代词作主语的主谓一致,并列主语的主谓一致等等.
这里属于并列主语的主谓一致里的and,both...and连接的并列主语.
当and连接的并列主语代表两样不同的事物表示复数概念,用动词复数.例:
Both rice and cotton grow in the sothern area.
如果and连接的并列主语指同一人,或是一样东西如salt and water盐水,bread and butter涂黄油的面包,或指有两个部件配成的物品如a knife and fork刀叉,a cup and saucer杯碟,用动词单数形式.例:The watch and chain is beautiful.
所以上面的Mr.David and his wife只两个人,所以用动词复数,完整的应该是Mr.David and his wife go to work toghter every morning.