3句英文任你选

Take time off as necessary.
如果需要的话，就请假吧。

Please stay at home since you're not feeling well.
身体不舒服就待在家里休息。
 
Could you fill in the request form for taking the day off?
填一张请假条好吗?

半个句型要记牢

request form for taking the day off (请假条)

Tip:一般的公司都有相关的请假制度，请假要填写请假条，然后正式审核，再决定批准。因此，请假时可能都得 fill in the request form for leave。