Present "concentrate" | I | concentrate | |
Present Continuous "concentrate" | I | am concentrating | |
Simple past "concentrate" | I | concentrated | |
Past Continuous "concentrate" | I | was concentrating | |
Present perfect "concentrate" | I | have concentrated | |
Present perfect continuous "concentrate" | I | have been concentrating | |
Past perfect "concentrate" | I | had concentrated | |
Past perfect continuous "concentrate" | I | had been concentrating | |
Future "concentrate" | I | will concentrate | |
Future continuous "concentrate" | I | will be concentrating | |
Future perfect "concentrate" | I | will have concentrated | |
Future perfect continuous "concentrate" | I | will have been concentrating |