Contoh ungkapan checking understanding

When you want to make sure someone understands you. 

- (Do you) know what I'm talking about?
– (Do you) understand what I'm saying? 
- (Do you) know what I'm saying? 
– (Do you) know what I mean? 
– Does that make any sense? 
– Do you understand? 
– Do you follow me? 
– Are you following me? 
– Are you with me (so far)? 
– With me so far? 
– Have you got it? 
– Any questions? 
– You know? 
– You see? 
– Got it? 
– Right? 

When you understand what someone is saying. 

– I understand what you're saying. 
– I hear what you're saying.
– I see what you're saying.
– I know what you mean. 
– I see what you mean. 
– I get it./I got it.
– I understand. 
– I'm with you. 
– I hear you.  
– I know. 

– I see.
– Gotcha. (Informal) 

When you don't understand what someone is saying. @(^.^)@ 
 
– I'm not sure I know what you mean.
– I'm not sure I get what you mean.
– (I'm sorry.) I don't understand.
– I'm not sure I get your point.
– I don't quite follow you.
– I'm not following you. 
– What was that again?
– What do you mean?
– I don't follow you.    
– I don't get it.