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Rule "'must to' instead of 'have to'"

This is one of many errors that LanguageTool can detect.

Description: 'must to' instead of 'have to'
Message: After 'must', the verb is used without 'to'. Probably, you should use <suggestion>must</suggestion> or <suggestion>have to</suggestion> here.
Category: Grammar (ID: GRAMMAR)
Incorrect sentences
that this rule can detect:
  • I must to go shopping.
    Correction suggestion: must, have to
Correct sentences
for comparison:
  • It is a must to be aware of that.
  • And I do what I must to defeat her.
ID: MUST_HAVE_TO [1]
Version: 6.8-SNAPSHOT (2025-10-28 22:33:08 +0100)