NET

18 Now the birth of Jesus Christ happened this way. While his mother Mary was engaged to Joseph, but before they came together, she was found to be pregnant through the Holy Spirit.

Darby

The Birth of Jesus Christ

18 Now the birth of Jesus Chris^D6615t was thus: His mother, Mary, that is, having been betrothed to Joseph, before they came together, she was found to be with child of [the] Holy Spirit.

Darby Bible Notes

is - The Greek expression here translated 'that is' emphasizes the peculiar manner of the birth.

KJV

The Birth of Jesus Christ

18 Now the birth of Jesus Christ was on this wise: When as his mother Mary was espoused to Joseph, before they came together, she was found with child of the Holy Ghost.

Strong's

18 Now ^G1161 the birth^G1083 of Jesus^G2424 Christ^G5547 was^G2258 on this wise^G3779: When as^G1063 his^G846 mother^G3384 Mary^G3137 was espoused^G3423 to Joseph^G2501, before^{G4250 G2228} they^G846 came together^G4905, she was found^G2147 with child^{G1722 G1064 G2192} of^G1537 the Holy^G40 Ghost^G4151.