Can I reprogram the pwd command to add a trailing slash?

WHen I use the pwd command, it prints e.g /opt instead of /opt/. I would like it to print the trailing slash. However, I tried adding the following line to my ~/.bash_aliases file:

alias pwd=" echo "${PWD}/" "

But it doesn't work properly. Instead of printing my present working directory with a trailing slash, it prints the working directory I was in **at the start of the terminal session**, or at the last time I ran the source ~/.bashrc command. Even when I name the command something different, like cwd, it still behaves this way. So - my question is, can I have some way to have an alias that prints my present working directory, followed by a trailing slash? Thanks.