u/Cringeworthy253

The rule of thumb I learned when i was just getting the subjunctive was that you only use the subjunctive when there is more than one subject. However as I've started to learn the finer points of the subjunctive it seems like this rule doesn't really apply. For example, one sentence i saw today was:

"I don't think i can do that."

The two translations I saw were:

"No creo que pueda hacer eso."

"No creo poder hacer eso."

The first one is the one that throws me off, as it seems to break that guideline.