Zero or First conditional?       Hi everyone! I was wondering if you could help me figure out the following if conditionals. Are they zero or first conditionals?    
1.I can't get to sleep if I drink a lot of coffee. ( Can I replace 'can't' by 'won' t'? )    
2.You(need to/ 'll need to) improve your English if you want to study in Britain.    
3.My parents ( get/ will get) worried if I come home late. 
If the three conditionals are zero, can I use " will" to make them first conditionals.? 
Thanks in advance      |