一个人在外国，他有时候会感到很孤单。

Yí gè rén zài wàiguó, tā yǒu shíhou huì gǎndào hěn gūdān.

Being alone in a foreign country, he sometimes feels very lonely.

今天工作很多，他感到有点累。

Jīntiān gōngzuò hěn duō, tā gǎndào yǒudiǎn lèi.

There is a lot of work today, and he feels a bit tired.

工作了十五个小时以后，我感到累了。

Gōngzuò le shíwǔ gè xiǎoshí yǐhòu, wǒ gǎndào lèi le.

After working for 15 hours, I feel really tired.