third conditional

If Roentgen ​ (a)   X-rays, Franklin ​ (b)   to do her research.

• hadn't discovered
• wouldn't be able

​ (a)   Newton ​ (b)   the laws of motion if he ​ (c)   physics?

• Would
• have written
• hadn't studied

If Leonardo da Vinci ​ (a)   left-handed, ​ (b)   he ​ (c)   in code?

• hadn't been
• would
• have written

If Einstein ​ (a)   his father, he ​ (b)   en electrical engineer.

• had obeyed
• would have become

Marconi ​ (a)   the radio so quickly if he ​ (b)   in Italy.

• wouldn't have developed
• had stayed

Match the following

• if they had listened to the teacher.

• The students wouldn't have been punished

• if my computer hadn't crashed.

• If he had passed his exams

• would humans have appeared?

• If dinosaurs hadn't died out

• if Oppenheimer hadn't split the atom?

• I wouldn't have lost my research

• he would have gone to university.

• Would scientists have developed nuclear energy

Look at the pictures. Then, use the prompts to complete the conditional sentences.

If he had studied, he _____ [understand] the exercise.

He wouldn't have exploded the laboratory if he _____ [be] more careful.

If they had brought a map, they ____ [get lost].

The cake would have grown if she _____ [follow] the recipe.