maintain是系動詞嗎

maintain不是系動詞。

Mankind have been trying every means to maintain the balance of nature.人類採用一切手段保持生態平衡。

We must maintain a firm attitude.我們必須採取堅定的態度。

The government has taken a measure to maintain the stability of prices.政府已經採取了措施以確保物價穩定。

Mindful of the need to maintainefficient communication， the board of directors decided to construct a new communication network.董事會注意到維持有效通訊的需要，因此決定建立一個新的通信網。

In order to maintain physical well being， a person should eat wholesome food and get sufficient exercise.為了維持身體健康，一個人應該吃有益健康的食品，並經常鍛鍊身體。

The car has to be constantly maintained.汽車必須經常保養。

He is too poor to maintain his family.他太窮了，無法養活家人。

Part of my job is to maintain good relationship with our suppliers.我的部分工作是同我們的供應商保持良好的關係。