no le habisan

[Rusty]

I doubt he eats his shoe.
= Dudo que él coma su zapato.
I doubt he'll eat his shoe.
= Dudo que él coma su zapato.
I doubt he ate his shoe.
= Dudo que él comiera su zapato.

You use the present subjunctive in the first and second cases, and the imperfect subjunctive in the third case.

[Fazor]

Ah, gracias. La [pagina Web?] estoy usando no dices sobre "imerfect subjunctive".

Hmm.. sencence structure... Is it okay to insert the "estoy usando" as a ... "Phrase that describes the subject" (Did I mention my knowlege of gramar terms is lacking? ;)). Or should it be ordered like "I am using a website that ..." ?

Anyway, thanks. Either the study site I'm at doesn't talk about that tense/mood, or it's under a header called something else and I've yet to find it. Is it conjugated the same way as the imperfect tense?

[Fazor]

Speaking of past subjunctive;

Penso que yo comé mayonesa mal con mi almuerzo. Ugh. :(

[Rusty]

Ah, gracias. La página Web que uso no dice nada del "imperfect subjunctive".

Anyway, thanks. Either the study site I'm at doesn't talk about that tense/mood, or it's under a header called something else and I've yet to find it. Is it conjugated the same way as the imperfect tense?You can see its conjugation here, or I can point you in the right direction in your studies (provide me details via PM if you'd like). To find the conjugation here, look in the upper left-hand corner of this page. Under the Tomísimo logo is a text box that contains 'Search...'. If you type in a verb and select 'Conjugations' in the pull-down menu to the right of the input box, the verb conjugation page will appear. Look for block number 7 (Imperfecto de Subjuntivo). Notice there are two different ways to conjugate that tense.

[Fazor]

Nifty. So...
Speaking of past subjunctive;

Penso que yo comiese mayonesa mal con mi almuerzo. Ugh. :(

Is that correct? Or (per the other thread) correcter? :)

[Rusty]

Speaking of past subjunctive;
Penso que yo comiese mayonesa mal con mi almuerzo. Ugh. :(
The subjunctive is not needed in this sentence (there is no reason to use the subjunctive mood).
You should use creer instead of pensar (whose 1st-person construction is pienso, by the way).

You can say "Creo haber comido mayonesa mala ...," (I think (believe) I've eaten bad mayonnaise ...) or you can say "Creo que comí mayonesa mala ..." (I think (believe) I ate bad mayonnaise ...).

It looks like you found the imperfect subjunctive (comiese/comiera) just fine. If you want to see it in action, negate the verb to create doubt:
No creo que él comiera/comiese mayonesa mala ...
(This is what your doctor says to the nurse after they send you home from the emergency room when you're feeling better.)

[Fazor]

Ah, so since there's not doubt that I did the action (rather, doubt that the action is the culprit) then I don't need the subjunctive.

¿Que es la diferencia entré 'Pensar' y 'Creer'? Yo conozco que 'Pensar' es 'Think' y 'Creer' es 'Believe', pero no están los mismos?

[Rusty]

When you're thinking (doing the reasoning, planning), you use pensar. You use creer when you're expressing an opinion.

The subjunctive is used in a number of different circumstances, doubt being one of them.