1) καὶ γὰρ ὅτε πρὸς ὑμᾶς ἦμεν, προελέγομεν ὑμῖν ὅτι μέλλομεν θλίβεσθαι, καθὼς καὶ ἐγένετο καὶ οἴδατε. (1 Thess 3:4)
Translation: For also, when we were with you, told you beforehand that we were about to suffer tribulation, just as also it has happened and [just as] you know.
Parsing: ἐγένετο – Second Aorist Middle Indicative 3rd sg, γίνομαι
2) ἀπέδου τὸν λαόν σου ἄνευ τιμῆς (Ps 43:13)
Translation: You sold your people without price.
Parsing: ἀπέδου – Second Aorist Middle Indicative 2nd sg, ἀποδίδωμι. The aorist stem for δίδωμι is δο-. The ending is the alternate ending ου instead of σο. The resulting form is απεδοου, but οου contracts to ου, giving you the final form ἀπέδου.