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Detecting helping verbs

Is there any way or category(postag) with the help of which I can identify the helping verbs in a sentence?

I list of part-of-speech tags with examples can be found at https://github.com/languagetool-org/languagetool/blob/master/languagetool-language-modules/en/src/main/resources/org/languagetool/resource/en/tagset.txt

yeah I had seen that, but it does not differentiate between the helping and main verbs