Hi, gang!! 
 
A little help, please.  I have an adult learner, late 20s. First language is Portuguese, learning English for immigration purposes.  Lately we �ve been working on helping him improve by forcing his mind to think about his own mistakes.  
 
I �m looking for exercises that do this. For example:  I �ve been giving him sentences with various verb tenses done horribly wrong, and asking him to fix them.   Or to properly construct them.   
 
Such as:   8:00  Started studying   8:30  Time now 
1)  I "have been studying" for 30 minutes. 
2)  I "started" studying 30 minutes "ago"  (he needs help with prepositions of time as well) 
 
8:00 time now
9:00  eat dinner
 
I "haven �t eaten" dinner "yet"  
 
 
You get the idea.   
 
I �ve been searching our lovely site here for similar exercises, but I �m coming up empty.  Have any of you created such exercises? If so, I �d be tickled if you �d share the link.  
 
Please and thank you :-)