0 You came home and found a letter from a friend. You read and wrote him back a letter. You can say"01font 00I 02font 01font 01font 00am very02font 00 happy 01font 00to have received02font 00 your letter".
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00both present and past tenses12blockquote10No. There's no past tense here. The perfect infinitive 01i00to have received02i00 shows anteriority, but it's not a past tense. This combination is just fine. No problem.02br