"If you're not feeling so well, cancel the lesson and get some rest."
- "If you're not feeling so well, cancel the lesson and get some rest."
"If ~" 「〜であれば」
"you're" = "you are"
"you're not feeling so well" 「貴方が体調が良くないよう」"you're not feeling well" も言えます。
"cancel the lesson" 「レッスンを休講して」
"get some rest" 「静養を」
If you don't feel well please cancel the lesson and rest.
"貴方の体調が良くないようであればレッスンを休講して静養を"
- If you don't feel well please cancel the lesson and rest.
- If you are not feeling well please cancel our lessons and take time to rest.
静養を
- rest (to get better)
get better = 回復してください？
オーストラリア 
アメリカ合衆国 
