improve on/upon something | meaning of improve on/upon something in Longman Dictionary of Contemporary English | LDOCE
Verb table
improve
| Simple Form | |
| Present | |
| I, you, we, they | improve |
| he, she, it | improves |
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| Past | |
| I, you, he, she, it, we, they | improved |
| Present perfect | |
| I, you, we, they | have improved |
| he, she, it | has improved |
| Past perfect | |
| I, you, he, she, it, we, they | had improved |
| Future | |
| I, you, he, she, it, we, they | will improve |
| Future perfect | |
| I, you, he, she, it, we, they | will have improved |
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| Continuous Form | |
| Present | |
| I | am improving |
| he, she, it | is improving |
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| you, we, they | are improving |
| Past | |
| I, he, she, it | was improving |
| you, we, they | were improving |
| Present perfect | |
| I, you, we, they | have been improving |
| he, she, it | has been improving |
| Past perfect | |
| I, you, he, she, it, we, they | had been improving |
| Future | |
| I, you, he, she, it, we, they | will be improving |
| Future perfect | |
| I, you, he, she, it, we, they | will have been improving |
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