0First, it is not a sentence, but is only a phrase. You should also know that some grammarians prefer to include 01i 00be (un)able to02i 00 among the semi-auxiliarie verbs. In that case, your phrase would parse as:02br 02br 01i 00[be] unable to see02i 00-- V02br 01i 00clearly02i 00 -- Adverb modifying V02br 02br 00If we consider 01i 00unable02i 00 an adjective:02br 02br 01i 00unable02i 00 -- Adj02br 01i 00to see clearly02i 00 -- infinitive adverbial clause modifying01i 00 unable02i 02br 01i 00clearly02i 00 -- Adverb modifying 01i 00see02br 02br 02i 00 0-
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