Used to show direction, place, or position, such as going toward something. It also appears before a verb in its basic form, as in 'to eat' or 'to go.'
From Old English 'tō' meaning 'in the direction of, for, with respect to.' It is related to German 'zu' and Dutch 'toe.' Over time, it took on many grammatical roles, including marking the infinitive form of verbs.
This tiny word is doing double duty: it points in space ('go to school') and also marks verb forms ('to learn'). That’s why learners mix it up with 'too' and 'two'—they sound alike but play totally different roles. 'To' is one of the quiet engines that keeps English sentences moving.
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