1. Shall we fix a date for the picnic?
我們定一下野餐的時間好嗎？
還能這樣說：
Shall we appoint a time for the picnic?
Can we set a time for the picnic?
應用解析：
be no picnic 有困難或麻煩，不是輕松的事。
例如：Travel abroad is no picnic.
海外旅行可不是一件輕松的事情。
2. If the weather is fine, we are going camping this weekend.
如果天氣好的話，我們周末去露營。
還能這樣說：
If it is sunny, we decide to go camping this weekend.
Why not go camping this weekend if the weather permits?
應用解析：
the finer points of sth. 只有行家才能領略和欣賞到的某些方面和細節；
get sth. down to a fine art 學會將某事物做得盡善盡美
3. Let's meet at the gate around two o'clock, and not leave without seeing each other.
咱們兩點鐘左右在大門口碰頭，不見不散。
還能這樣說：
We will meet at the gate around two o'clock. Be there or be square.
Let's make it two o'clock at the gate, and not leave without seeing each other.
應用解析：
between you and me and the gatepost 嚴格保密；
a gate of ten thousand 萬人觀眾；
gate sb. for sth. 懲罰性禁止（學生）離校
4. After April, we've got to make time for the picnic.
4月以后我們還得留點時間野餐。
還能這樣說：
After April, we need to leave some time to picnic.
We need to save some time for the picnic after April.
應用解析：
make do with sth. 用某事物勉強應付；將就；湊合。
例如：We are in a hurry so we had to make do with a quick snack.
我們時間很緊，就胡亂吃了頓小吃。