1)Present Simple :to write,to learn,to describe
2)Present Progressive:writing,learning,describing
3)Present Perfect : have/has written,learned,described
4)Perfect Progressive:have/has been learning,writing,describing.
Past Simple:wrote,learned,described
Past Progressive:was/were learning,writing,describing.
Past Perfect:had written,written,described
Perfect Progressive:had been writting и всем глаголам ing