Napisz zdania używając present perfect simple lub Present perfect Continuous 1. he/ work / on this project / since joining the company . 2.How much field data / you / collect. 3. Erik an Al/ study/ agriculture / for two years and they are really enjoying it. 4. They/ design / a robot system to kill weeds and theyate/ it to potential manufacturers over the last few weeks. 5. Since the 1980s made / a number of improvements in design. 6. They/ not/ use/ this machine for long. They still need sonme time to get used to it.