大きい or 大き-い

Sorry the topic might not make much sense. Anyway I Was doing lessons on lingodeer grammar and this came up.

Now I was under the impression that the word 大きい was one word but their explanation seem to imply that the い is a suffix. Same thing with 美味しい。And if I understand correctly they are both I adjectives. Was this the case of them generalising their I-adjectives or??

Sorry if my question doesn’t make any sense.

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Yep, the い in い-adjectives is suffix! It can’t stand on its own or be attached to words that aren’t い-adjectives, though.

In this case, です is just added for politeness. い-adjective + だ is ungrammatical.

ETA: The stem 大き (おおき) can be conjugated like this:
大きい -> non-past
大きくない -> non-past negation
大きかった -> past
大きくなかった -> past negation
大きく -> adverb ‘in a big way’
大きさ - noun form ‘size’/bigness
(add です to any of these for extra politeness)

But also … it can be conjugated like this (so can 小さ, but most adjectives can’t):
大きな(noun)
implied (but unused): 大きだ・です - non-past
implied (but unused): 大きじゃない - non-past negation
implied (but unused): 大きだった・でした - past
implied (but unused): 大きじゃなかった・じゃなかったです - past negation

You’ll notice that ない is also an い-adjective, and so is the -たい form of verbs.

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Also, 大き can have other suffixes such as く or さ, such as 大きく成りました (became larger). Or 大きさ (size).

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I would still consider 大きい the word. But as the others said, the stem is 大き, allowing 大きい to conjugate into 大きく, 大きくない, 大きさ, etc.

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Thanks so much for your explanation. Makes so much sense now. I should probably study more in depth grammar.

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Definitely!! 大き can’t stand on its own! The い is a bound morpheme.

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Which is exactly what you’re doing. :smiley: 頑張って!!

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