Cud u pls explain what non-finites are actually? I mean to say what do they represent? It is said that they cannot have any tense but infinitives and participles have forms for present, past and perfect.
Also, in the use of the infinitve can "to be admired" can we say that it is formed with the help of a participle?
Non-finites don't change form. For example, the participle walking, below, doesn't change it's form, but the verb phrase it participates in does:
The same holds true for past participles. For example,
will have eaten
In answer to your second question, yes. Admired is a past participle.
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