Help the eccentric inventor complete the safety protocols for his new time machine by dragging the correct conditional conjunctions into the blanks.
The university board has agreed to fund our temporal displacement device, provided that we strictly limit our initial tests to inanimate objects.
We must formulate a flawless contingency plan right now, supposing a confused velociraptor accidentally follows you back to the lab.
The core reactor will automatically initiate an emergency shutdown, unless you remember to recalibrate the cooling valves every three hours.
The correct answers are:
The university board has agreed to fund our temporal displacement device, provided that we strictly limit our initial tests to inanimate objects.
Provided that establishes a strict condition for a positive outcome (they will fund it only if we limit the tests). "Unless" would reverse the logic, and "supposing" creates a hypothetical question rather than a firm agreement.
We must formulate a flawless contingency plan right now, supposing a confused velociraptor accidentally follows you back to the lab.
Supposing is used to invite someone to imagine a hypothetical situation (meaning "what if").
The core reactor will automatically initiate an emergency shutdown, unless you remember to recalibrate the cooling valves every three hours.
Unless introduces a negative condition, meaning "if you do not." The reactor shuts down if you do not recalibrate the valves.
Conditional sentence
A conditional sentence describes one situation as depending on another. It pairs a condition clause (usually starting with if) with a consequence clause: If it rains, we'll stay in. The condition can refer to general truths, real future possibilities, hypothetical present situations, or unreal past situations — and each type uses a specific tense pattern.
English teaching groups these into zero, first, second, third, and mixed conditionals. Mastering them lets you talk about plans, regrets, hypotheticals, and warnings — territory you can't reach with simple present and past tenses alone.
Conjunction
A conjunction is a word that connects other words, phrases, or clauses. English has two main types: coordinating conjunctions join units of equal weight (and, but, or, so, yet, for, nor — the FANBOYS), while subordinating conjunctions introduce dependent clauses (because, although, if, when, while, since, unless).
Conjunctions are how you build compound and complex sentences instead of stacking short ones. The choice of conjunction signals the relationship between the ideas — addition, contrast, cause, condition, time — so picking the right one shapes the whole meaning.
Complex sentence
A complex sentence combines an independent clause with at least one dependent (subordinate) clause: I missed the bus because I overslept. The dependent clause adds extra information — usually about time, reason, condition, or which thing is meant — but can't stand alone. It's introduced by a subordinating conjunction (because, although, if, when, while) or a relative pronoun (who, which, that).
Mastering complex sentences is the move from simple, choppy writing to prose that links ideas. It's also where comma decisions get interesting — placement depends on which clause comes first.
C1 | Advanced
C1 is the advanced level in the CEFR framework, sitting between B2 and C2. At C1 you stop translating in your head and start thinking in English — handling specialised articles outside your field, picking up implicit meaning, and writing structured arguments on complex topics.
Grammatically, C1 means natural use of inversion (Rarely have I seen…), mixed and advanced conditionals, subjunctive forms in formal contexts, and cleft sentences for emphasis. Most university programmes for non-native speakers and many professional certifications set C1 as their entry standard.
Difficulty: Hard
The Hard difficulty tag marks questions and challenges aimed at upper-intermediate to advanced learners — typically B2 and above. Expect interacting rules, edge cases, distractors that look right at first glance, and contexts where the surface meaning and the grammatical answer don't match.
Filter by Hard when you're past the basics and want material that genuinely tests your understanding. These questions catch the gaps your textbook didn't — register-sensitive choices, exception cases, mixed conditionals, the difference between would have been and had been.