Question

Dudo que _____ todas estas ruinas en un año.




A. excaven


B. pesan


C. miden


D. trazan

Answer 1

Hello!
This is a sentence where you express doubt (*Dudo*= "I doubt").
So remember the next verb needs to be in subjunctive.

How is the subjunctive formed?
Verbs whose infinitive ends in -AR --> have *-e(-)* in their ending
Verbs whose infinitive ends in -ER and -IR --> have *-e(-)* in their ending

So from that you can guess which verbs (from the options you have) are in subjunctive.

*excaven* --> this is from *excavAR* --> So YES: it is in subjunctive.
*pesan* --> this is from *pesAR* --> So this is not in subjunctive
*miden* --> this is from *medIR* --> So this is not in subjunctive
*trazan* --> this is from *trazAR* --> So this is not in subjunctive either

So this way you can get your answer! :)
Hope this helps!
Blessings

Answer 2

Thanks that was a big help!

Answer 3

You're welcome! :)
Oh, sorry, I realised I made a mistake in the rules I gave you...

Verbs whose infinitive ends in -ER and -IR --> have *-a(-)* in their ending

(So for -ER/-IR verbs, I meant *-a(-)*, not *-e(-)*.)

Anyway, I'm glad this didn't actually affect to your understandig the question :)
Blessings