“Mustn't have” suggests an 80% certainty , whereas “couldn't have” provides 100% certainty. Both a) and b) are correct.
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/sing-sung-sung/
18 июн. 2015 г. — Sung was the usual form of the past tense in the 17th and 18th centuries. As late as 1836, sang was still less in use than sung . Although some ...
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/100-words-for-facia...
28 янв. 2012 г. — And of course, raised eyebrows can indicate surprise, alarm, skepticism etc. A twitching cheek can indicate anger, worry etc. Context can help ...
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/explaining-the-expl...
“than him” is correct : She likes Johnny Depp more than he (does). She likes Johnny Depp more than him (more than she likes him). This is a valid defense of “ ...
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/borne-by-borne-on-a...
Borne is used as a suffix to create words that have the sense of being carried or distributed : Water-borne diseases are any illness caused by drinking water ...
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/is-that-even-a-word...
Most serious writers agree on the correct or preferred form of a word that is one of two or more variants or on whether a word is acceptable at all.
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/finding-founding-an...
6 нояб. 2017 г. — A find is something discovered or located , including a person, place, or thing with exceptional qualities.
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/35-synonyms-for-loo...
1. Blink : to look at with disbelief, dismay, or surprise or in a cursory manner 2. Browse: to look at casually 3. Consider: to look at reflectively or steadily.
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/have-vs-having-in-c...
I am having = I am actively engaged in doing something. I have = I am in a state of being related to the possession of something. Some ...
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/the-uses-of-the/
1) We use “the” with names of oceans and rivers (“the Mississippi”, “the Indian Ocean”) 2) We use “the” with names of mountain ranges (“the Andes”) but not ...
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/have-vs-having-in-c...
Have should always be in the simple present tense for the meaning “to own,” or to describe medical problems. For example: They have a new car. I have a bad cold. It is incorrect to say “ I am having a cold” or “ I am having a new car.”
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/regarding-re/
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/what-for-is-for/
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