will wait ...; will be waiting ...

http://www.englishforums.com/English/WillWaitAndWillBeWaiting/gdwzc/post.htm

http://www.bbc.co.uk/worldservice/learningenglish/grammar/ask_about_english/071217/

1. I will wait for you.
2. I will be waiting for you.

簡單說，1 主要是交代整體的action。這比較一般性(比如和朋友去買東西。你不想看了，要在店外頭等，你這樣子說就行)

2 則多了些細節(似乎要對方知道，我會是處於"在等你..在等你..在等你"這樣子的持續狀態裡頭) 一個適用情況是...比如情人間(就想像一個漫畫少女眼睛滿是星光:"I'll be waiting for you (until I see you again)"(比如BBC的那個例子)

剩下的話，多閱讀/聽/看，多接觸實際例子，久了你自然會學到/累積講這話的適用情況

steak doneness

某家餐廳/牛排館的menu:

RARE: COOL, RED CENTER
MED-RARE: WARM RED CENTER, WITH A HINT OF PINK
MEDIUM: WARM PINK CENTER
MED-WELL: SOME PINK In CENTER
WELL: NO PINK, COOKED ALL THE WAY THROUGH

Google: degrees of steak doneness

"The boss had me checking / check ..."

have 本來就有這些用法。第一題單純的選項A,C不應該同時出現(第2題沒有check這選項，所以還好)。V-ing 這用法字典裡頭就有了:

http://oaadonline.oxfordlearnersdictionaries.com/dictionary/have
26 .... 第2個句型用法

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The boss had me_____all of last month's sales figures.
(A) to check (b) checked (c) checking (d) checks

答案是 (c)

https://groups.google.com/forum/#!original/tw.bbs.lang.english/Ugd6CAyLPBk/oPVX8P2yYlIJ
(回答的人是程度不錯的美國人)

https://groups.google.com/forum/#!original/tw.bbs.lang.english/Ugd6CAyLPBk/0X5eJZkV0QEJ