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Gutasniff Posted 19 years ago
Grammar
Have to Versus Must
Hi,
I'm trying to do an excercise. I have to chose which one is the INCORRECT answer.
Although human beings aren't able to percieve such changes, it is thought the the sensitive nervous systems of some animals COULD / HAVE TO / MUST be affected by them.
The answer is apparently "have to" although I cannot understand why - its seems to be that each option is correct! Could refering to possibility and "must to" and "have to" being used to express certainty ?
Thanks
I'm trying to do an excercise. I have to chose which one is the INCORRECT answer.
Although human beings aren't able to percieve such changes, it is thought the the sensitive nervous systems of some animals COULD / HAVE TO / MUST be affected by them.
The answer is apparently "have to" although I cannot understand why - its seems to be that each option is correct! Could refering to possibility and "must to" and "have to" being used to express certainty ?
Thanks
Top answer
have to is not as good as could or must , so have to should be chosen as the "incorrect" answer. Here's why. , involving logical possibility and necessity.
- have to is not as good as could or must , so have to should be chosen as the "incorrect" answer.
- Here's why.
- , involving logical possibility and necessity.
- , involving personal obligations, and only less often as a modal of logic.
- The situation described in the sentence ( nervous systems -- affected by certain changes ) seems to me to involve logic, not social interaction.
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2 Answers
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have to is not as good as could or must, so have to should be chosen as the "incorrect" answer. Here's why.
Both could and must are modals of logic, i.e., involving logical possibility and necessity. have to is typically used as a modal of social interaction, i.e., involving personal obligations, and only less often as a modal of log
Both could and must are modals of logic, i.e., involving logical possibility and necessity. have to is typically used as a modal of social interaction, i.e., involving personal obligations, and only less often as a modal of log
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