1. Frequency adverbs in English, such as usually, sometimes, always, etc., indicate the regularity of actions and differ in degree. Here is a common ranking of frequency adverbs from highest to lowest frequency: always (100%) > usually (80%) > often (60%) > sometimes (40%) > seldom (20%) > hardly (10%) > rarely (1%) > never (0%).
2. Frequency adverbs are generally used to indicate the frequency of actions. They are often placed before the main verb (except when the main verb is a modal or auxiliary verb) and after non-finite verbs (like being, doing, or having).
3. Non-finite verbs include three types: 1) linking verbs (e.g., be), 2) auxiliary verbs (e.g., do, does, will, shall, have), and 3) modal verbs (e.g., must, can, may). All other verbs are called finite verbs.
Note: The percentages provided in the ranking are approximate indicators of frequency, not precise figures.
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