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Here's my take:

1. 'to' because 'speak' always pairs with 'to' or 'with' as far as I know

MIA61. Today the teacher started speaking at /to me and I freaked out. Should it be 'at' or 'to' me?

2. All you do is to make a lot of money. All you do is making a lot of money. Do these two sentences mean the same thing?

thanks.

For the first sentence I would say 'to'; for the

Of your choices, speak to, for sure. (Speak also works with "with" but that's when both people have the discussion equally.)

All you do is make a lot of money is the most natural. You don't need the to. The second one - with the participle - doesn't really work with "all you do."

ex: All you can do is hope for his safe return. All you can do is pray for his reco

Grammar GeekOf your choices, speak to, for sure. (Speak also works with "with" but that's when both people have the discussion equally.)

All you do is make a lot of money is the most natural. You don't need the to. The second one - with the participle - doesn't really work with "all you do."

ex: All you can do is hope for his safe retur

All you do is make a lot of money. (the 'to' is normally omitted)

'Make a lot of money' here is a (bare) infinitive clause without a subject. The understood subject is 'you': All you do is [you] make a lot of money. The -ing form does not work here, because 'do' does not call for an object