word problem（最好有埋e.g. 解釋）

１）係咪太舊會查唔到gratuitous呢個字！？ - Should not. Mine was 1970’ s.
Example :
1. 免費的;無償的;無報酬的
Our parents’ love to us is gratuitous.
2. 無端的
John’s anger on me is gratuitous. I really do not know why.
３）gratuitous(adj.) and free(adj.)<--他們可以共用嗎 ? – yes
Example : This is a gratuitous service = This is a free service.
４）instant(adj.) 同 instantanous (adj.) <--他們可以共用嗎 ? – Yes, but the degree of urgency is different :
Instant = immediate, instantaneous has a meaning of sudden / in a very short moment, so instantaneous is more urgent.
Examples :
After hearing his story, my instant response is to go home.
This email is urgent, we have to take instantaneous action.

instantly(adv.) 同 instantanously (adv.) <--他們可以共用嗎 ? Yes, again same difference in degree of urgency.
Example :
After hearing his story, I instantly go home.
This email is urgent, we have to act instantaneously.

5)其實immediately(adv.)=shortly(adv.)=instantly(adv.)
他們也有相通的解釋
那一個最常用？ Immediately
Example : I am very hot, I want to take a coke immediately.
那一個最小用？ Instantly
Example : I am very hot, I want to take a coke instantly.

Shortly does not have meaning as instant or immediately. Shortly means in the near future / soon
Example : My exam is coming, I will study shortly after this weekend.