1. Use of This : ' This ' is always use for single person / object / place Which near to speaker . Example : 1. This is my pen . 2. This is my phone etc. 2 Use of That : ' That ' is always use for single object / place/ person which are away from the speaker. Example : 1. That place is very beautiful. 2. That boy is not good . 3. Use of These : ' These ' is always use for more than one objects/ persons/ places/ which are near to speaker . Example : 1. These are my books . 4. Use of Those : ' Those ' is always use for more than one objects/ persons/ places which are away from the speaker. Example : 1. Those stars are very bright.
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