Open ended questions still help, even if answers are gestures or single words.
A point, a sound or a look all count as communication.
Respond warmly and build on what they give you.
If you would like more reassurance, read
Responding to Baby Babble for ideas on encouraging early attempts at talking.
Open ended questions are not about testing your child.
They are about inviting them in.
One thoughtful question a day is enough to start building richer conversations.
Small changes, repeated often, make a big difference.