1). Present
simple - Chinese people discover gunpowder
2). Present
continuous - Chinese people are discovering gunpowder
3). Present
perfect - Chinese people have discovered gunpowder
4). Present
perfect continuous - Chinese people have been discovering gunpowder
5). Past
simple - Chinese people discovered gunpowder
6). Past continuous
- Chinese people were discovering gunpowder
7). Past
perfect - Chinese people had discovered gunpowder
8). Past
perfect continuous - Chinese people had been discovering gunpowder
9). Future simple - Chinese people will discover gunpowder
10). Future
continuous - Chinese people will be discovering gunpowder
11). Future
perfect - Chinese people will have discovered gunpowder
12). Future
perfect continuous - Chinese people will have been discovering gunpowder