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hi Teachers,

'So do I' is an informal expression use in conversations to express the same opinion or idea.
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Here you need a past participial adjective, the third form of a verb.

"used" is correct in your example.
Thanks for your help, but I have never heard of past participal adjectives. Everything learnt, everything to be learn!Emotion: rolleyes

One more, can I assume that after 'be' I always have to use 'used'?
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Thinking SpainThanks for your help, but I have never heard of past participal adjectives. Everything learnt, everything to be learn!

One more, can I assume that after 'be' I always have to use 'used'?
So do I' is an informal expression, which is used in conversations to express the same opinion or idea.

I hope the above helps.
Thanks! Yes it does.

Then, can I assume that after 'be' I always have to use 'used'?
Thinking SpainThanks! Yes it does.

Then, can I assume that after 'be' I always have to use 'used'?
Yes.
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Thank you very much. Clear and concrete.