A couple of Spanish tense questions?

If you're talking about a survey from a couple of years ago in which people expressed opinions about something, which tense would you use when referring to what they thought? E.g ...personas sentían que los americanos tratan los inmigrantes... Would sentir and and tratar be in the imperfect for this? The... show more If you're talking about a survey from a couple of years ago in which people expressed opinions about something, which tense would you use when referring to what they thought? E.g ...personas sentían que los americanos tratan los inmigrantes...
Would sentir and and tratar be in the imperfect for this? The preterite? Would they both be in the same tense?

One more thing, when saying Pienso que... would any following conjugated verbs be in the subjunctive form?

Thanks :)
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