1.Is nineteen more than eighteen?
十九比十八多吗？
2.Ten plus nine is nineteen.
十加九是十九。
3.How old are you? I am nineteen.
你多大了？我十九岁了。
4.Where was he born and where did he visit when he was nineteen?
他在哪里出生，19岁时去了哪里？
5.I am nineteen years old.
我十九岁。
6.'Nineteen years,' the husband says.
“十九年了，”丈夫说。