"Must" and "need to" are both modal verbs that are used to express obligation or necessity, but they differ in their degree of urgency and the source of the obligation.
"Must"
expresses a strong sense of obligation, necessity or requirement. It implies
that there is no choice, and something must be done. It often carries a sense
of urgency and is used when the consequences of not doing something are
significant. It is also used when the obligation comes from the speaker, for
example, "I must finish this project by tomorrow."
"Need
to," on the other hand, is a more neutral expression of obligation. It
suggests that something is necessary or required, but it doesn't carry the same
sense of urgency or force as "must." It is often used when the
obligation comes from an external source, for example, "I need to submit
the report by the end of the week."
In summary,
"must" conveys a stronger sense of urgency and personal responsibility,
while "need to" is a milder expression of obligation and emphasizes
external requirements.
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