“请给他叉子”，这个句子中“叉子”前可以不加“一个” “我要吃这鸡",此句中要在”鸡“前加冠词”只“

I think ”请给他叉子” used "请”，the sentence is a little formal,so if add "一个" is better； "给他叉子！” is an informal way,a rude way. "我要吃这鸡！” is orally correct, Formally we say"我要吃这只鸡”“我要吃这块鸡”

请给他一个叉子and请给他叉子 The two sentences all are right. 我要吃这鸡is right.you can also say 我要吃这(只)鸡 Hope that helpful to U

both right in oral Chinese "请给他叉子"This sentence leave out the numeral and the article .because in a normal thinking , a person need only one.