How do I use 深深 in a sentence?
figure out the difference between 的，地，得（all are pronounce de but with different tone)
they are fixed expressions.
chinese adj + 的 + noun.
adj + 地 + verb.
adj + 得 + degree verb.
so in this case, 深深的 is an adjective, 深深地 is an adverb.
打 means to hit which is a verb, so 用力地打 is to hit hard.
and you can say 用力打 without 地 for it is a fixed expression.
for those words/phrases can either be a verb or an adjective, you could still speak without 的/地 in most cases ‘cause we can figure out whether it is an adv + verb phrase or an adj + noun phrase according to the context.
take 打击, which means blow, for example
此次行动 对 敌人 造成了 沉重(的)打击。=&gt; this action has made a great blow on the enemies.
此次行动 沉重(地)打击了 敌人。=&gt; this action greatly hit the enemies.