my sone was the same, he was just over 2 and nobody could understand him at all, there is a major waiting list for speech therapy here and i didnt know what to do. I got offered a place on a course for parents of children with delayed speech and here are the tips they gave me 1) dont ask too many questions because its overwhelming for a child who doesnt have the vocab to answer, so they wont even try
2)if your child has a few words, use the a,r,e, model that means acknowledge, ie yes, repeat, it is a ball, exapand, its a red ball. Add one or 2 words for each word they say.
3)sing lots to your child. singing helps develop speech and inflictions. Kids dont care how off pitch and out of tune u are so belt out those nursery rhymes
4)use easy to understand actions, so if you ask "do you want a drink?" pretend you are drinking out of a cup.
5)praise and acknowledge every attempt in the right direction, even if the sound is nothing like the word they are trying to say.
implementing these tips and skills, as well as putting my son into daycare had amazing results. He is now 3 and talking as well as most kids his age.