5. Have you decided on a place for the picnic?
你選好野餐的地點了嗎？
還能這樣說：
Have you made your mind where we go for the picnic?
Have you already selected a place for the picnic?
6. Can you come this Saturday?
星期六怎么樣？
還能這樣說：
Do you have time this Saturday?
Are you available this Saturday?
應用解析：
Saturday-to-Monday 周末；
Hospital Saturday 為醫院募捐的星期六
7. Do not forget to bring matches, or you'll be unable to build a campfire.
別忘了帶火柴，否則就點不著火了。
還能這樣說：
You must take matches with you, or you will not make a fire.
You have to make a campfire with matches.
諺語：
The fire which lights us at a distance will burn us when near.
遠火照明，近火灼人。
8. You need to put on sunglasses for protection against the strong light.
你需要戴上墨鏡以防強光的照射。
還能這樣說：
Sunglasses are a must, or you may be hurt by the strong light.
Wearing sunglasses is very necessary which can help you avoid the strong light.
應用解析：
be going strong 健康良好，保持旺盛精力，仍然硬朗；
be strong against 堅決反對；
be strong in 擅長；
be strong under 在……堅定不移