Albert Barnes Commentary Matthew 1:18

"Now the birth of Jesus Christ was on this wise: When his mother Mary had been betrothed to Joseph, before they came together she was found with child of the Holy Spirit." — Matthew 1:18 (ASV)

In this way. Thus. In this manner.

Espoused. Betrothed, or engaged to be married. Among the Jews, there was commonly an interval of ten or twelve months between the contract of marriage and the celebration of the nuptials (Judges 14:8); yet, such was the nature of this engagement that unfaithfulness to each other was deemed adultery (see Deuteronomy 22:25, 28).

With child of the Holy Ghost. See Luke 1:35.