τρέχ	ω		τρέχ	ων	running
χορεύ	ω		χορεύ	ων	dancing
βαδίζ	ω		βαδίζ	ων	walking
ποι	ῶ		ποι	ῶν	doing
βο	ῶ		βο	ῶν	shouting
πληρ	ῶ		πληρ	ῶν	filling

What about neuter and genitive? [model: 1st person plural present tense]

φέρ	ομεν		φέρ	ον		φέρ	οντος	carrying
ἄγ	ομεν		ἄγ	ον		ἄγ	οντος	finding
καθίζ	ομεν		καθίζ	ον		καθίζ	οντος	sitting
φιλ	οῦμεν		φιλo	οῦν		φιλ	οῦντος	loving
τιμ	ῶμεν		τιμ	ῶν		τιμ	ῶντος	honouring
πληρ	οῦμεν		πληρ	οῦν		πληρ	οῦντος	filling

And the feminine forms? [model: 3rd person plural present tense]

θαυμάζ	ουσιν		θαυμάζ	ουσα	admiring
πάσχ	ουσιν		πάσχ	ουσα	experiencing, suffering
πέμπ	ουσιν		πέμπ	ουσα	sending
οἰκ	οῦσιν		οἰκ	οῦσα	living, dwelling
ἐρ	ῶσιν		ἐρ	ῶσα	loving (see lesson 6a, erotic)
πληρ	οῦσιν		πληρ	οῦσα	filling

Declining present active participles presents no problems:
Neuter forms are the same as masculine except for nom/acc.sg τρέχον and nom/acc.pl. τρέχοντα 

Contract verbs:

Except of course for the likes of πλέω: πλέων, πλέοντος  (no contraction except when  ε meets ε and they become one  ει which of course does not happen in the case of the present participle.

Only fly in the ointment, as usual, the verb TO BE

ὁ ἀνὴρ  ἡ  γυνὴ  τὸ παιδίον

παύεται  παύεται  παύεται

χαλεπός ὤν  χαλεπή  οὖσα  χαλεπόν ὄν

We say: Dikaiopolis, an Athenian, lives and works in the country.
They said: ὁ δὲ Δικαιόπολις, Ἀθηναῖος ὤν, οἰκεῖ τε καὶ πονεῖ ἐν τοῖς ἀγροῖς.
We say: Melitta, a little girl, cries very easily.
They said: ἡ δὲ Μέλιττα, κόρη μικρὰ οὖσα, μάλα ῥᾳδίως δακρύει.