tests by here4u with the online test builder (683 tests)

601. Quite or Quiet (1429 candidates)
602. Preterite or Present Perfect (20387 candidates)
603. To say / to tell ... (3359 candidates)
604. Too - Also - As well - Either - Not either (10231 candidates)
605. Let's come or Let's go (6421 candidates)
606. Use of tenses : The worst enemy ? The best friend ? 2/2 (4038 candidates)
607. Use of tenses : The worst enemy ? The best friend ? 1/2 (9383 candidates)
608. Uncountables and Countables (4064 candidates)
609. Too (much/many) or Enough (3710 candidates)
610. Verbs of involuntary perceptions ... (2280 candidates)
611. Infinitive, continued ! (2003 candidates)
612. Infinitive after verbs expressing will power ... (8605 candidates)
613. Not everyone has ... (2181 candidates)
614. What about suggesting ... (4141 candidates)
615. Difficulties of the Passive Form (16332 candidates)
616. 'Make someone do'/'Have something done': (a little further) (42958 candidates)
617. We'd still like to work on more tenses ...(2/2) (1746 candidates)
618. We want to work with tenses ...(1/2) (2403 candidates)
619. Two simultaneous actions in the past ... (12534 candidates)
620. Cause ? Aim? Not mixing the two concepts ... (22632 candidates)