tests by here4u with the online test builder (669 tests)

661. Prepositions and particles (1663 candidates)
662. Conditional present and past (26053 candidates)
663. Rephrasing and modals (11672 candidates)
664. For - since - ago and tenses (5932 candidates)
665. Use of tenses in a text (14218 candidates)
666. Rephrasing of verbs (4111 candidates)
667. Some forms of verbs (1829 candidates)
668. Prepositions and particles (1537 candidates)
669. To do or To make (2409 candidates)
670. To do or Not to do (1639 candidates)
671. A few difficult words (3084 candidates)
672. Question tags (1303 candidates)
673. Need of articles (2085 candidates)
674. Compound adjectives (2443 candidates)
675. Particles (1477 candidates)
676. From plural to singular (5247 candidates)
677. Particles (2026 candidates)
678. Question tags (1347 candidates)
679. Verbs in several tenses (3470 candidates)
680. Countable or uncountable (2668 candidates)