谈恋爱

sb and sb are going together/walking out.

例:

Carry on a love affair.

正在谈恋爱

Have romantic experience with sb

和某人谈恋爱

Are Kevin and Tracey going together?

凯文和特蕾西在谈恋爱吗？

Are Tony and Jane going steady?

托尼跟简是正在谈恋爱吗？

Mark and Barbara are going together now.

马克与巴巴拉现在正在谈恋爱。