Mankind has never experienced changes in life and work on such

Mankind has never experienced changes in life and work on such a scale.

1. Has mankind ever experienced changes in life and work or in consuming goods on such a scale?

2. What has mankind ever experienced on such a scale?

3. Mankind has never experienced changes in life and work on such a scale, has it?

4. Has mankind ever experienced changes in life on such a scale?

The task of the world community is to improve the ecological situation in the world.

1. Is the task of the world community to improve the ecological situation in the world or to use solar energy panels around the world?

2. Whose task is to improve the ecological situation in the world?

3. The task of the world community is to improve the ecological situation in the world, isnt it?

4. Is the task of the world community to improve the ecological situation in the world?

In six years we shall become engineers.

1. Shall we become engineers or majors in six years?

2. When shall we become engineers?

3. In six years we shall become engineers, shant we?

4. Shall we become engineers in six years?