A verb's tenses are made from four basic forms. These basic forms are called the verb's principal parts.
PRESENT PRESENT PARTICIPLE PAST PAST PARTICIPLE
watch (am, is, are) watching watched (has, have, had) watched
study (am, is, are) studying studied (has, have, had) studied
A regular verb forms its past and past participle by adding -ed or -d to the present form.
- The present and the past forms can be used by themselves as verbs
- The present participle and the past participle are always used with a helping verb.
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