Am I correct? 1 If I don't know the gender, I should use "they", not "that person or this person" in the present. Ex: a I should say "If you meet someone today, they'd better be a doctor." not "If you meet someone today, that person / this person had better be a doctor.". b I should say "When you pray for someone—how does your prayer affect the way you feel about them (not that person / this person)? c I should say "To cultivate a warm bond with someone, we must get to know them (not that person / this person) well." 2 If the listener and I don't know the gender, I can use "they or that person" in the past. Ex: I can say "Someone snuck into my house last night. That person was a thief, weren't they?" or "Someone snuck into my house last night. They were a thief, weren't they?" 3 If the speaker know the gender and I don't know the gender, I still can use "they or that ..." in the past. Ex: - I met a doctor last night. - Was that doctor friendly? or "Were they friendly?" Thanks!