a kind of和this kind of後面加的是名詞單數還是名詞複數請加句型

a kind of和this kind of後面加的是名詞單數還是名詞複數請加句型

a kind of一種…
this kind of這種…
其後的名詞單複數都可以,差別在於前者是泛指,後者是特指.
\x09
An apple is a kind of fruit.
We often do this kind of exercise.