Hello,
could you please tell me, which of these sentences you find correct an which of them are definitely wrong.
1. Do buy the new collocations dictionary, even if you have several before.
2. Do buy the new collocations dictionary, even if you had several before.
3. Do buy the new collocations dictionary, even if you have had several before.
4. Do buy the new collocations dictionary, no matter how many you have before.
5. Do buy the new collocations dictionary, even if you already have several (dictionaries).
Thank you for your answers!