If I come (εαν ελθω). Third class condition, supposable case (aorist subjunctive).

What shall I profit you (τ υμας ωφελησω). Two accusatives with this verb (see 1. Corinthians 13:3).

Unless I speak (εαν μη λαλησω). Second condition (also third class) with the one conclusion (cf. 1. Timothy 2:5).