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I practice to improve my writting skills. I just learned the following:

after adjective we use to + verb.

For example,

These students are difficult to teach.

However, I am confused about the following sentences:

Different types of models will be necessary, depending on what forecast horizon is most important.

Forecasts that need to be produced frequently are better done using an automated system than with methods that require careful manual work.

And Once it has been determined what forecasts are required, it is then necessary to find or collect the data on which the forecasts will be based

I am Ok with the latter sentence as it follows what I learned. However, what about the former sentences? Why we did not add to + verb to after the adjective?

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    "Depending" is a preposition, so "depending on what forecast horizon is most important" is not a clause but a preposition phrase functioning as a supplementary adjunct. In your second example "better" is not an adjective but an adverb.
    – BillJ
    Jul 27 '20 at 8:48
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[1] These students are [difficult to teach].

[2] Different types of models will be necessary, [depending on what forecast horizon is most important].

[3] Forecasts that need to be produced frequently are better [done using an automated system than with methods that require careful manual work].

In [1] the infinitival clause is, as you say, complement of "difficult".

In [2] "depending" is a preposition, so "depending on what forecast horizon is most important" is not a clause but a preposition phrase functioning as a supplementary adjunct.

In [3] "better" is not an adjective but an adverb, and adverbs can't take infinitival clauses as complement.

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