the G can run more quickly than the D
这需要看搭配词语决定.
如果用专有名词或人名,替换G,D,前面的定冠词the就不需要了.如：
Tom can run more quickly than Jack.
如果是普通名词,只需要直接替换所给结构中的G,D就可以了.例如：
The horse can run more quickly than the donkey,
or
A horse can run more quickly than a donkey.
祝你开心如意!