關於現在式既問題想問問

Doris 你好~

"There are many motorcycles in Taiwan."
一句指的是 「台灣有很多摩托車。」

使用 simple present tense (簡單現在式) 這是指現在的一般情況。
不是在過去，不是在將來，而是現在，但著眼點也並非要指要現在這一刻。因此，使用 simple present tense (簡單現在式) 是正確的，無問題。

如果你想表達的不是現在的情況，而是以前的情況，那當然你應該用 simple past tense (簡單過去式):
"There were many motorcycles in Taiwan."

所以，你詢問的「句子用什麼時態有無問題」，主要看的是你想表達什麼。

或者你也可以說說你覺得不確定的地方，那麼大家可以針對你不懂或誤會的部份再作解釋。

The usage depends on you.
The present tense:- If it is an eternal truth,general facts, a habit, then use the simple present.
eg:-There are many motorcycles in Taiwan every day.
The usage depends on your good self if the action began and completed in the past without any connection with the present tense,then use the simple past:-
eg:-There were many motorcycle in Taiwan yesterday.
Then you have no problems with your two sentences.