δύναμαι I can, I am able to

 

Easy to pronounce - and to remember, "can, able to" keeps that α in ALL of its forms:

Compare:
 Present 
receives Who? is able to
δέχ ομαι  I δύνα μαι   
δέχ ει [εσαι] you (sg) δύνα σαι 
δέχ εται     he, she, it    δύνα ται 
δεχ όμεθα  we δυνά ́μεθα 
δέχ εσθε  you (pl) δύνα σθε 
δέχ ονται  they δύνα νται 
 
Imperfect
was receiving Who? was able to
 ἐδεχ όμην  I   ἐδυνά μην   
 ἐδέχ [εσο] 
ου 		 you (sg)  ἐδύνα
ἐδύνa		 σο or
ω
 ἐδέχ ετο  he, she, it    ἐδύνα το 
ἐδεχ όμεθα  we  ἐδυνά μεθα 
 ἐδέχ εσθε  you (pl)  ἐδύνα σθε 
 ἐδέχ οντο  they   ἐδύνα ντο 
 
Imperative
receive! accept!   be able!
 δέχ ου [εσο] you! (sg.)   δύνα σο  
 δέχ εσθε  you! (pl.)   δύνα σθε
 
Infinitive
to receive, accept   to be able to
 δέχ εσθαι     δύνα σθαι   
 
Participle
receiving, accepting   being able to
 δεχ όμενος     δυνά μενος 
 
 
 Remember :
If there is a sigma between the thematic vowel and the ending, that sigma is dropped and the 2 vowels, for reasons of euphony, contract.
"You want" should be:
  • stem δεχ
  • thematic vowel ε
  • ending σαι
The sigma is dropped, leaving δεχ-ε-αι
The 2 adjacent vowels ε+α contract to
either η with the iota becoming subscript: -ῃ
or to ει.
δέχ-ε-σαι turns into δέχῃ or δέχει (which means that at some time the pronunciation of ῃ and ει must have been the same.)