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

601. Preterite or Present Perfect (20385 candidates)
602. To say / to tell ... (3358 candidates)
603. Too - Also - As well - Either - Not either (10219 candidates)
604. Let's come or Let's go (6420 candidates)
605. Use of tenses : The worst enemy ? The best friend ? 2/2 (4037 candidates)
606. Use of tenses : The worst enemy ? The best friend ? 1/2 (9375 candidates)
607. Uncountables and Countables (4062 candidates)
608. Too (much/many) or Enough (3709 candidates)
609. Verbs of involuntary perceptions ... (2280 candidates)
610. Infinitive, continued ! (2003 candidates)
611. Infinitive after verbs expressing will power ... (8603 candidates)
612. Not everyone has ... (2180 candidates)
613. What about suggesting ... (4134 candidates)
614. Difficulties of the Passive Form (16324 candidates)
615. 'Make someone do'/'Have something done': (a little further) (42944 candidates)
616. We'd still like to work on more tenses ...(2/2) (1746 candidates)
617. We want to work with tenses ...(1/2) (2403 candidates)
618. Two simultaneous actions in the past ... (12526 candidates)
619. Cause ? Aim? Not mixing the two concepts ... (22603 candidates)
620. Absence of obligation (25171 candidates)