Word: 乐观 (lèguān)

他的看法似乎太乐观了。

Tā de kànfǎ sìhū tài lèguānle.

His view seems to be too optimistic.

你的看法过于乐观。

Nǐ de kànfǎ guòyú lèguān.

Your view is too optimistic.

其他人不那么乐观。

Qítā rén bú nàme lèguān.

Others are less optimistic.

尽量保持乐观。

Jǐnliàng bǎochí lèguān.

Try to stay positive.

我不像你那么乐观。

Wǒ bú xiàng nǐ nàme lèguān.

I am not as optimistic as you are.

我时而乐观，时而悲观。

Wǒ shí'ér lèguān, shí'ér bēiguān.

I am by turns an optimist and a pessimist.

我没有你那么乐观。

Wǒ méiyǒu nǐ nàme lèguān.

I am not as optimistic as you are.