Both forms end in -ing. Nevertheless it is easy to find out whether it is a Gerund or a Progressive form.
Progressive tenses
These tenses are formed with von to be and the infinitive + - ing.
| sentences | tense |
|---|---|
| He is reading a book. | Present Progressive |
| He was reading a book. | Past Progressive |
| He has been reading a book for three hours. | Present Perfect Progressive |
| He had been reading a book before Mary came in. | Past Perfect Progressive |
| He will be reading a book when I get home. | will-future Progressive |
| He will have been reading a book. | Future Perfect Progressive |
| He would be reading a book if he had time. | Conditional Progressive |
| He would have been reading a book if he had had time. | Conditional Perfect Progressive |
| A book is being read. | Present Progressive - Passive |
| A book was being read. | Past Progressive - Passive |
Gerund
The Gerund is formed only with infinitive + - ing.
| sentence |
|---|
| Reading books is great fun. |
| He likes reading books. |
| He is looking forward to reading books at the weekend. |
| He is keen on reading books. |
| He is used to reading books. |
| What about reading books? |
| He likes the idea of reading books. |
| After reading the book, he went to bed. |
| I remember having read this book. - Passiv |
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