You may have difficulty with two similar sounds in English. This is why the course has comparison worksheets. Take a look at an example comparison worksheet below comparing the /b/ and /v/ sounds.
1) The green title shows the two sounds that are being compared in IPA symbols and then two example words.
2)Most comparison worksheets will have a video lesson explaining the differences between the sounds.
3) You can click the purple arrows to go to the single sound worksheets if you want more information about a single sound and further practice.
4) The differences between the sounds are summarised here.
5) Here are diagrams of the two sounds.
The next page shows the second page of the comparison worksheet