Fix grammar (#1027)

README.md

@@ -4,11 +4,11 @@
 
 **Qiskit** is an open-source framework for working with noisy quantum computers at the level of pulses, circuits, and algorithms.
 
-Qiskit is made up elements that each work together to enable quantum computing. This is a simple meta-package to install the elements of Qiskit altogether.
+Qiskit is made up of elements that work together to enable quantum computing. This is a simple meta-package to install the elements of Qiskit altogether.
 
 ## Installation
 
-The best way of installing `qiskit` is using `pip`:
+The best way of installing `qiskit` is by using `pip`:
 
 ```bash
 $ pip install qiskit
@@ -38,7 +38,7 @@ and if you want to run your experiments on real systems you need the 5th element
 ## Contribution Guidelines
 
 If you'd like to contribute to Qiskit, please take a look at our
-[contribution guidelines](https://qiskit.org/documentation/contributing_to_qiskit.html). This project adheres to Qiskit's [code of conduct](CODE_OF_CONDUCT.md). By participating, you are expect to uphold to this code.
+[contribution guidelines](https://qiskit.org/documentation/contributing_to_qiskit.html). This project adheres to Qiskit's [code of conduct](CODE_OF_CONDUCT.md). By participating, you are expected to uphold this code.
 
 We use [GitHub issues](https://github.com/Qiskit/qiskit/issues) for tracking requests and bugs. Please use our [Slack](http://ibm.co/joinqiskitslack) for discussion and simple questions. For questions that are more suited for a forum we use the Qiskit tag in the [Stack Exchange](https://quantumcomputing.stackexchange.com/questions/tagged/qiskit).