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Adverbs of indefinite frequency, such as ‘sometimes’, ‘occasionally’, ‘usually’, ‘normally’, ‘regularly’, and ‘often’, are commonly used with the present simple tense to indicate routine or repeated activities without specifying exact timing. These adverbs typically precede the main verb but follow the verb ‘to be’ and auxiliary verbs. They can also be positioned at the beginning or end of a sentence in some cases. The webpage provides examples of these usages in various contexts, including TED talks and student writings.

In contrast, definite adverbs of frequency, like ‘yearly’, ‘weekly’, ‘every hour’, and ‘every day’, provide exact frequencies and usually appear at the end of a sentence. The webpage also highlights the overlap and differences in the usage of these adverbs at different language proficiency levels (A1 and A2).

Furthermore, it presents common collocates for the adverb ‘usually’ and examples of sentences using ‘often’. The examples illustrate common behaviors or thought processes, suggesting that these adverbs are integral to expressing frequency in English.